| (19) |
 |
|
(11) |
EP 1 338 556 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
07.01.2004 Bulletin 2004/02 |
| (43) |
Date of publication A2: |
|
27.08.2003 Bulletin 2003/35 |
| (22) |
Date of filing: 24.02.2003 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR |
|
Designated Extension States: |
|
AL LT LV MK RO |
| (30) |
Priority: |
26.02.2002 JP 2002049322
|
| (71) |
Applicants: |
|
- Sumitomo Chemical Company, Limited
Osaka-shi Osaka 541-8550 (JP)
- National Institute of Advanced Industrial Science and Technology
Tokyo 100-8921 (JP)
|
|
| (72) |
Inventors: |
|
- Ono, Keiji
Tsukuba-shi, Ibaraki (JP)
- Miyazaki, Susumu
Kitasoma-gun, Ibaraki (JP)
- Ezuhara, Takayoshi
Tsukuba-shi, Ibaraki (JP)
- Nishisu, Yoshihiro, c/o Tsukuba Center National
Higashi, Tsukuba-shi, Ibaraki (JP)
- Kobayashi, Mikio , c/o Tsukuba Center National
Higashi, Tsukuba-shi, Ibaraki (JP)
|
| (74) |
Representative: VOSSIUS & PARTNER |
|
Siebertstrasse 4
81675 München
81675 München (DE) |
|
| |
|
| (54) |
Process for producing particles of a metal compound |
(57) The object of the present invention is to provide a process for producing particles
of a metal compound having a spherical particle shape and an average particle diameter
larger than 0.3 µm without employing high-pressure conditions. This object is achieved
by a process for producing particle of a metal compound comprising a step of adjusting
pH of an aqueous solution containing urea and at least one metal element to from 4
to 8, a step of heating the aqueous solution under normal pressure, a step of separating
a solid from the solution, and a step of drying the solid.